# wgrib2: -if_fs, -not_if_fs

## Introduction

The -if_fs option is the same as the
the -if option except it takes "fixed strings"
rather than extended regular expressions. The same hold
for the -not_if_fs and -not_if options.

## Usage

```
-if_fs X
-not_if_fs X

X is a fixed string (not a regular expression)
```

See also: [-if](./if.md),

---

> Description: if X if X (fixed string) does not match, conditional execution up to next output/fi

_Docs derived from <https://www.cpc.ncep.noaa.gov/products/wesley/wgrib2/not_if_fs.html>_
